Extensible hack saw frame



Nov. 4, 1952 G. A. LINDENAU EXTENSIBLE HACK SAW FRAME Filed July 28, 1950 Patented Nov. 4, 1952 UNITED STATES PATENT OFFICE EXTENSIBLE HACK SAW' FRAME Gustav A. Lindenau, Stevenson, Wash.

Application July 28, 1950, Serial No. 176,398

2 Claims. 1

This invention relates to hand saws, and more particularly to an extensible hacksaw frame.

An object of this invention is to provide a hacksawframe which is particularly adapted to receive and tension hacksaw blades.

Another object of this invention is to provide a hacksaw frame which is particularly adapted for quickly and speedily replacing an interchangeable standard hacksaw blade.

A further object of this invention is to provide an extensible hacksaw frame which is readily adjustable for different sizes of hacksaw blades.

A still further object of this inventionis to provide an extensible hacksaw. framev which is relatively simple in structure and cheap to manufacture.v

, The above and still further objects and advantages of the invention will; become apparent upon consideration of the following detailed description of the invention, when taken in conjunction with the accompanying drawings, wherein:

Figure 1 is a side elevational view of the hacksaw frame of the present invention, shown supporting a hacksaw blade;

, Figure 2 is a fragmentary top plan view of the extensible hacksaw frame shown in Figure 1;

Figure 3 is an enlarged fragmentary sectional view taken along the line 3-3 of Figure 1;

and I l I Figure 4 is a fragmentary side elevational view ofthe extensible hacksaw frame of the present invention, shown in position for adjustment to receive any of a plurality of sizes of standard hacksaw blades.

Referring now moreparticularly to the drawings, wherein like reference numerals have been used throughout the several views to designate like parts, there is shown the extensible hacksaw frame of the present invention, generally designated by the reference numeral Ill supporting a hacksaw blade II.

The hacksaw frame embodies a supporting plate I2 which is provided with an arm I3 depending from one end thereof, the plate and arm forming a supporting member. Positioned contiguous to one side of the supporting plate I2 and secured thereto is a handle II for manually grasping the frame I0.

1 Positioned transversely of the supporting plate has one end fixedly secured to the plate I2.

Supportedin the sleeve I5 is an L-shaped arm I'l which has its long arm I8 extending into one end of the sleeve I5 and projecting from the other end thereof. The short leg of the L- shaped arm, designated by the reference numeral I9, is disposed in substantially side-by-side spaced relation with respect to the depending leg I3 of the supporting plate I2 and is movable toward and away from the latter upon movement of the long leg I8 thereof with respect to the sleeve I5.

Secured transversely of the free end of the depending arm I3'and the short leg I9 are the supporting barrels and H. Each of the barrels is provided with alongitudinally extending bore '22, 23 for the reception of asupporting rod 24, 25. Contiguous to their outer ends, each of the .rods 24, 25 has secured thereto an abutment plate 26, 21 for engagement with the adjacent end of the barrel 20, 2|. Contiguous to their inner or free ends, the rods 24, 25 have secured thereto transversely extending pins 28, 29 which are engageable within the apertures provided in the ends of the saw blade II to thereby support the blade therebetween. Accordingly, upon tensioning the rods 24, 25, the blade II will be fixedly secured therebetween.

Opera'tively connected to the L-shaped arm I! and the sleeve I5 is a hand actuated means, generally designated by the reference numeral 30 for holding the L-shaped arm I! in a select position of its movement with respect to the sleeve I5. The hand actuated means 30 embodies a tensioning linkage 3I which overlies the sleeve I5 and has one of its ends pivotally connected to the free end of the long leg I8 of the L-shaped arm II. As clearly illustrated in the drawings; the tensioning linkage 3I embodies two bars 32 and 33 disposed in side-by-side spaced relation with respect to each other and having one end connected by means of the U- shaped bracket 34 and the pin 35 to the free end of the long leg .IS of'the L-shaped arm IT. The other ends of the bars 32 and 33 are upwardly offset, as indicated by the reference numerals 36 and 31, into spaced, parallel relation with respect to the upper face of the sleeve I5. Circumposed about the sleeve I5 and slidable therealon'g is a yoke'38 which'includes a depending dog 39. 'With reference to Figure 3, it-will be seen that the yoke 38 is of a size such as to permit endwise playrelative to the sleeve I5. The adjacent upper face of the sleeve I5 is provided with a plurality of longitudinally spaced notches, generally designated by the reference numeral 49, for selective engagement with the depending dog 39. Positioned contiguous to the upper end of the yoke 38 is a lever 41 which has one of its ends pivotally connected to the yoke by means of the pin 42. As clearly illustrated in Figure 2, the upwardly offset ends 36 and 31 of the bars 32 and 33 are arranged on opposite sides of the lever 4| and pivotally connected to the latter intermediate its ends by means of a movable pivot 43. The free end of the lever 4| is provided with a hand grip 44 for effecting the. rotary movement of the lever 4| about the pivotal axis 42. Secured to the depending dog '39 of the yoke 38 is a spring 45 which is engageable with the sleeve H: for normally urging the depending dog 39 into engagement with the notches 48. As clearly illustrated in Figure 4, the spring 45 embodies offset end sections 46 and 41 interconnected by an inclined connecting section 46. The offset end section 41 is disposed contiguous to and beneath the pivotally supported end of the lever 4|.

In actual use, the lever 4| is rotated from the position illustrated in Figure 1 in a clockwise direction .to. the upright position indicated in Figure 4, and then the lower end of'the yoke 38 is slid manually toward the bracket 34 or the dotted position shown in Figure 4, resulting in the movement of the dog 39 out of engagement with the notches 40. While the yoke 38 is being manually held in the dotted position shown in Figure 4 with the dog 39 free of engagement with the notches 48 and the lever 4| in its upright position, the sleeve |5 is manually slid back along the long arm |8 toward the short leg I8. At this .point, the lower end of the yoke 38 is re- 7 leased, resulting in the dog 39 being shifted into loose engagement with the adjacent one of the notches 4|! by means of the spring 45 or the'full line position of Figure i. The lever 4| is then actuated in a counterclockwise direction until the short leg I9 is spaced from the supporting rod to accommodate a saw blade ll of a length to be inserted therebetween. The saw blade II is then disposed intermediate the free ends of the depending arm I3 and the short leg l9 of the L-shaped arm I1 and is engaged by the pins 28 and '29. The hand grip 44 is then grasped and the lever 4| rocked about the pivotal axis 42 to the position indicated in Figure 1. During this rocking movement of the lever 4|, the blade II is tensioned, and the lower end of the yoke 38 is simultaneously tilted toward the short leg l9 resulting in the lower end portion of the yoke 38 being caused to engage the adjacent portion of the sleeve 5 and the dog being moved into tight bearing engagement withrthe adjacent one of the notches 4, the position-shown in Figures 1 and 3.

To effect release of the L-shaped arm H for sliding movement it is merely necessary to grasp the hand grip 44 and rotate the lever 4| to the upright position of Figure 4, detach the blade H from engagement with the pins 28 and 29, and then shift the lower end of the yoke 38 to the dotted line position of Figure 4 to thereby move the dog 38 out of engagement with the notches 40.

Although only one embodiment of the extensible hacksaw frame of the present invention has been described, it is readily apparent that numerous modifications can be made without departing from the spirit of the invention as set forth in the appended claims.

What I claim is:

1. A frame for supporting and tensioning a saw blade comprising an upstanding supporting member, an open ended sleeve positioned adja- 4 cent the upper end of said supporting member and fixedly secured to the latter, an L-shaped arm having its long leg extending slidably through said sleeve, the short leg of said L- shaped arm being disposed in side by side spaced relation with respect to said supporting member, means on the free end of said short leg and the lower end of said supporting member for the support therebetween of a hacksaw blade, and hand actuated means operatively connected to the long leg of said L-shaped arm and said sleeve for holding said L-shaped arm in select positions of its movement relative to said sleeve, said means comprising a linkage positioned longitudinally of said sleeve and having one end pivotally connected to the free end of said long leg of said L-shaped arm, a yoke loosely circumposed about and slidable along said sleeve, a dog carried by the upper end of said yoke and selectively engageable with a plurality of longitudinally spaced notches provided on the adjacent face of said sleeve, and alever arranged exteriorly of said yoke and having one end'connected to the upper end of said yoke for movement about an axis transverse of said sleeve and connected adjacent said one end to the other end of said linkage for movement about another axis transverse of said sleeve.

2. A frame for supporting and tensioning a saw blade comprising an upstanding supporting member, an open ended sleeve positioned adjacent the upper end of said supporting member and fixedly secured to the latter, an L-shaped arm having its long leg extending slidably through said sleeve, the short leg-of said. L-s'haped armbeing disposed in side by side spaced relation with respect to said supporting member, means on the free end of said short leg and the lower end of said supporting member for the support therebetween of a hacksaw blade, and hand actuated means operatively connected to the long leg of said L- shaped arm and said sleeve for holding said L- shaped arm in select positions of its movement relative to said sleeve, said means comprising a linkage positioned longitudinally of said sleeve and having one end pivotally connected to the free end of said long leg of said L-shaped arm, a yoke loosely circumposed about and slidable along said sleeve, a dog carried by the upper end of said yoke and selectively engageable with a plurality of longitudinally spaced notches provided on the adjacent face of said sleeve, a spring having one end secured to said dog and having the other end engageable with said sleeve for urging said dog into engagement with said notches, and a lever arranged exteriorly of said yoke and having one end connected to the upper end of said yoke for movement about an axis transverse of said sleeve and connected adjacent said one end to the other end of said linkage for movement about another axis transverse of said sleeve.

GUSTAV A. LINDENAU.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS 

